package com.neuedu.day_19.homework;

class X {

    X() {

        System.out.print(1);

    }

    X(int x) {

        this();

        System.out.print(2);

    }

}

public class Y extends X {

    Y() {

        super(6);

        System.out.print(3);

    }

    Y(int y) {

        this();

        System.out.println(4);

    }

    public static void main(String[] a) {

        new Y(5);

    }

}

